Analysis of factors affecting ventilation resistance and air permeability of medical masks

At present, the types of masks circulating on the market are generally divided into air filter masks and air supply masks, and air filter masks are more widely used, such as dust masks, anti-haze masks, medical protective masks, etc. Types of masks have issued corresponding standards to regulate the mask market. Most of the protective filter mask standards implemented in our country are mandatory product standards, and there are many testing items. Among them, the ventilation resistance and air permeability of medical masks are routinely required performance, and the mask ventilation resistance tester is a common device for testing ventilation resistance. (Hong Kong) Co., Ltd. is a manufacturer, welcome to inquire. The mask ventilation resistance tester is suitable for measuring the ventilation resistance of medical surgical masks, disposable medical masks and civilian masks. Applicable standard: YY 0469-2011 Medical surgical mask YY 0969-2013 Disposable medical mask EN 14683: 2014 Main parameters: 1. Air source: suction type; 2. Air flow: 8L/min; 3. Sealing method: end face 4. The breathable diameter of the sample: Ф25mm; 5. The range of the differential pressure sensor: 0～500Pa. In addition, the fabric air permeability tester is used to detect the air permeability of fabric materials such as masks. The air permeability of the fabric is a characteristic of the fabric itself, which has a great relationship with the fabric structure and the combination of the fabric. The main components of masks are textile fiber materials, and breathability is also an essential feature of masks. The ventilation performance of the mask also determines other protective characteristics such as the comfort and filtration efficiency of the mask to a certain extent. At present, there is no more targeted testing standards for the breathability testing of masks, mainly referring to the testing methods for the breathability of fabrics, such as GB/T 5453-1997 'Determination of the breathability of textile fabrics', ASTMD 737-1996 'The breathability of textiles' Test Methods' and ISO 9237-1995 'Determination of Air Permeability of Textile Fabrics'. Factors affecting the breathability of masks: 1. Mask structure The material structure of masks, non-woven fabrics generally have a single-fiber network structure, good air permeability, and are more commonly used. For textile fabrics, the gap between the yarns is closely related to the air permeability of the fabric. The larger the gap, the better the air permeability. For example, gauze masks with larger gaps are more breathable than poplin and twill fabrics with tight structures. In general, knitted masks are more breathable than woven masks. The number of layers used in the mask material. In general, the more layers of masks, the poorer the breathability. For example, adding one or more layers of non-woven fabrics with particle filtering effect between two layers of spunbond non-woven fabrics or two layers of knitted woven fabrics will significantly reduce the air permeability. 2. When wearing a mask and the face is not well sealed, there will be gaps, and the airflow resistance of the gap is much smaller than that of the filter material, and the airflow will preferentially pass through the place with low air resistance. At this time, the wearer feels that the air permeability is good, but this At the same time, the protective effect of masks is greatly reduced. Therefore, when wearing a mask, it is still necessary to choose a mask that is suitable for your face size, and make full use of the adjustment functions such as nose clips and mask straps to ensure that the mask fits closely with the face, so that wearing it can achieve a good protective effect. 3. Filtration efficiency The breathability of masks has a certain correlation with the filtration efficiency of masks. When the ventilation of the mask is poor, the mask blocks the entry of foreign substances into the mask, the filtration efficiency is increased, but the wearing comfort is reduced.

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